Darrow3 - #59
The shock of being fooled brings out a rage in Pokey that is so intense, it actually summons Giygas himself. Although the fact that he was trying to psychically connect with Pokey may also have contributed.

Darrow3 - #61
Having had his body crack away, Giygas is reduced to a mass of flesh that can twist and reshape, but never return to its original form. The hatred and darkness that have driven him up until now are all that keep him going anymore.